11100016561 has 2 divisors, whose sum is σ = 11100016562. Its totient is φ = 11100016560.

The previous prime is 11100016513. The next prime is 11100016573. The reversal of 11100016561 is 16561000111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8657185936 + 2442830625 = 93044^2 + 49425^2 .

It is a cyclic number.

It is not a de Polignac number, because 11100016561 - 2¹³ = 11100008369 is a prime.

It is not a weakly prime, because it can be changed into another prime (11100016061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550008280 + 5550008281.

It is an arithmetic number, because the mean of its divisors is an integer number (5550008281).

Almost surely, 2^11100016561 is an apocalyptic number.

It is an amenable number.

11100016561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11100016561 is an equidigital number, since it uses as much as digits as its factorization.

11100016561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 22.

Adding to 11100016561 its reverse (16561000111), we get a palindrome (27661016672).

The spelling of 11100016561 in words is "eleven billion, one hundred million, sixteen thousand, five hundred sixty-one".